The CAS Registry Mumber 12201-79-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,2,2,0 and 1 respectively; the second part has 2 digits, 7 and 9 respectively. Calculate Digit Verification of CAS Registry Number 12201-79: (7*1)+(6*2)+(5*2)+(4*0)+(3*1)+(2*7)+(1*9)=55 55 % 10 = 5 So 12201-79-5 is a valid CAS Registry Number.
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